Computer Science
Multiple Choice
Questions
(MCQs) – Sets 4
with Detailed Explanations
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SET 4 – Computer Science MCQs
✅ No repetition from Set 1, Set 2, or Set 3
✅ 10 new questions
✅ Each explanation
Level: Class 9–10 / Beginners
1. What is a flowchart?
A. A programming language
B. A diagrammatic representation of an algorithm
C. A hardware device
D. A type of software
✅ Correct Answer: B
Explanation:
A flowchart is a visual diagram that shows the steps of an algorithm using symbols and arrows. It helps in understanding the flow of logic in a program. For example, a flowchart can explain how to calculate the sum of two numbers. Flowcharts are useful for planning, debugging, and explaining programs clearly.
2. Which symbol is used for decision-making in a flowchart?
A. Oval
B. Rectangle
C. Diamond
D. Circle
✅ Correct Answer: C
Explanation:
The diamond symbol is used to represent decisions in a flowchart. It shows conditions that result in two or more paths, such as yes/no or true/false. For example, checking whether a number is even or odd uses a decision symbol. This helps in logical thinking and structured program design.
3. What is the full form of LAN?
A. Local Area Network
B. Large Area Network
C. Logical Area Network
D. Limited Access Network
✅ Correct Answer: A
Explanation:
LAN stands for Local Area Network. It connects computers within a small geographical area such as a school, office, or home. LAN allows sharing of files, printers, and internet connections. It is faster and more secure than larger networks like WAN, making it ideal for local communication.
4. Which of the following is an example of an output device?
A. Scanner
B. Keyboard
C. Projector
D. Joystick
✅ Correct Answer: C
Explanation:
A projector is an output device that displays visual information from a computer onto a large screen. It is commonly used in classrooms and meetings for presentations. Output devices present processed data to users, helping them understand results. Other examples include monitors and printers.
5. What is a virus in computers?
A. A hardware fault
B. A type of operating system
C. A malicious program
D. An input device
✅ Correct Answer: C
Explanation:
A computer virus is a malicious program designed to harm a computer system. It can delete files, slow down performance, or steal data. Viruses often spread through infected files, email attachments, or unsafe downloads. Antivirus software is used to detect and remove such harmful programs.
6. Which memory is fastest in a computer?
A. Hard Disk
B. RAM
C. Cache Memory
D. CD-ROM
✅ Correct Answer: C
Explanation:
Cache memory is the fastest memory in a computer. It is located very close to the CPU and stores frequently used data and instructions. This reduces the time needed to access information from RAM. Cache memory improves overall system performance by speeding up processing tasks.
7. What is the full form of WWW?
A. World Web Wide
B. World Wide Web
C. Wide World Web
D. Web World Wide
✅ Correct Answer: B
Explanation:
WWW stands for World Wide Web. It is a system of interconnected web pages accessed through the internet. Websites use hyperlinks to connect information globally. For example, searching information on Google or reading articles online uses the World Wide Web. It plays a major role in communication and learning.
8. Which of the following is a type of network?
A. RAM
B. WAN
C. CPU
D. ROM
✅ Correct Answer: B
Explanation:
WAN stands for Wide Area Network. It covers a large geographical area such as cities or countries. The internet is the largest WAN. WAN allows long-distance communication between computers. Compared to LAN, it is slower but connects systems globally, enabling email, cloud storage, and online services.
9. What is the function of a modem?
A. Store data
B. Display output
C. Convert digital signals to analog and vice versa
D. Process instructions
✅ Correct Answer: C
Explanation:
A modem converts digital signals from a computer into analog signals for transmission over telephone lines and converts incoming analog signals back to digital form. This allows computers to communicate over the internet. Modems are essential for connecting home or office computers to internet service providers.
10. What is cybersecurity?
A. Designing software
B. Protecting computer systems and data
C. Making computer networks
D. Writing algorithms
✅ Correct Answer: B
Explanation:
Cybersecurity involves protecting computers, networks, and data from digital attacks such as hacking, viruses, and data theft. It includes using passwords, firewalls, and antivirus software. Cybersecurity is important for individuals and organizations to keep personal information and sensitive data safe in the digital world.
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